Telephone.



F. C. C. V. NESER & N. A. J. LlLLlENDAHL-PETERSEN.

TELEPHONE.

APPLICATION FILED FE`B.1.1911.

1,243,755. v Patented Oct. 23, 1917.

r sans rnNr -nin FREDERIK CHRISTIAN CARL VINCENT NZESER AND NIELS AUGUST JOANNES LILLIENDAHL-PETERSEN, OF COPENHAGEN,DEN1VIARK.

TELEPHONE.

Patented Cet. 2,3, 191'?.

Application filed February 7, 191'?. Serial No. 147,104.

To all whom t may concern.'

Be it knownthat we, (l) FREDERIK CHRIS- 'HAN CARL VINCENT NzEsER and (2) NIELS AUGUST JOHANNES LIILIENDAHL-PETERSEN, citizens of the Kingdom of Denmark, residing at (l) No. 81 Sortedamsdossering, (2) No. 1111 Blegdamsvej, both in Copenhagen,

in the Kingdom of Denmark, have inventedcertain, new and 'useful Improvements in r1elephones, of which the following is a specification. w

Our invention, which refers to auxiliary apparatus for telephones, microphones, and

the like, is based upon the experience'that a telephone membrane causes essentially plainer and stronger sound waves if, instead of immediately affecting the air, it is connected with the membrane in a soundin -box and is heard through its suitably arge trumpet. Consequently the invention consists. in the combination of a sounding-box,

supplied .with4 a trumpet, the membrane of which has a contact member-for a telephone membrane, and an underlay for conveniently v disposing a telephone, a microphone, or the like, as well asmembers which insure an adjustable contact between the contact membery of the sounding-box membrane and the telephone membrane. v

The drawing shows an outline sketch of one form of construction, by way of eX-` am le.

he sounding-box or tambour 1, is, lby means of a strap 2, movably suspended yon a standard 3. The sound-trumpet t'rests in,

a fork 5, whose screw-threaded rod 6 can -be adjusted by :means of a nut 7 in relamembrane in Contact 4with the telephone membrane 16. It the resilient underlay is properly adjusted, the speech can be heard very plain and strong through the trumpet 4, all disturbing sub-tones andv by-tones being eliminated by the transmission of the support tached to 'said sound boX, a supplemental sound-waves through the sounding-box. rlfhe speech can be heard at a distance from the apparatus, and thus can be heard by several persons at once. The hearer` or hearers can speak'into the microphone 17 in the usual manner, the trumpet of the microphone being eventually turned into the position 170.

The shown details are, both with respect i to the correlative situation of the bearingpiece and the frame ofthe sounding-box and their form, and with 4respect to the underlay` and its adjustment, withoutv significance to the invention, and can be modied in many different ways. j We claiml. The combination of a telephone, a

sounding box having a membrane provided with a projecting contact adapted lto engage the membrane of said telephone, a resilient -support for said telephone, anda movable support for said sound'box.

2. The 'combination of a telephone, a sounding boXl having a membrane provided with a spider frame carrying a projecting contact adapted to engage the membrane of said telephone, a resilient support for said telephone, and a movable support for said sound boX.

3.` The combination of 4a telephone, a sounding box having a membrane provided with a projecting contact adapted to vengage the membrane of said telephone, 'a resilient support for said telephone, a movable support for-said sound boX, and a trumpet -attached 'to said sound box.

4.9'. The combination of a telephone, a sounding box having a. membrane provided with a projecting contact adapted to Aengage the membrane of said telephone, a resilient support for said telephone, a movable or said sound boX, a trumpet atsuppot, for said trumpet, and means for adjusting` said supplemental support to regulate said contact withrelation to said telephone membrane.

"In testimony whereof we aflix our signatures. i

FREDEBIK CHRISTIAN CARL VINCENT NESER. NIELS AUGUST JOHANNES LILLIENDAHL-PETERSEN. v 

